Not so fast /forums/images/icons/grin.gif ! I have this on my '87 K5 with shackle flip and although it did not clear at first (the exhaust system was installed before the lift), it was easily modified to work. The system requires welding when you first assemble it, so you can just "twist" them into place accordingly. My finished product left the pipes about 3/8'' away from the front side of the shackle flip bracket and it doesn't interfere with the shackle itself at all.